After the upgrade, the swipe back and forth finger swipe has been reset (turned off). You will need to go into System Preferences > Magic Mouse and Check it to turn it back on.
I've been experiencing the same problems and it seems that the bluetooth has been dropping intermittently. This happens with a magic mouse and other devices I have connected via bluetooth, such as a headset.
After the upgrade, the swipe back and forth finger swipe has been reset (turned off). You will need to go into System Preferences > Magic Mouse and Check it to turn it back on.
Where is the buetooth antenna on your Mac?it seems that the bluetooth has been dropping intermittently.
Have found that the magic mouse response is at times very slow or even not responsive.